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Related Concept Videos

Neural Regulation of Blood Pressure01:18

Neural Regulation of Blood Pressure

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The neural regulation of blood pressure involves intricate interactions between the autonomic nervous system (ANS) and cardiovascular system, ensuring adequate perfusion of tissues. This regulation primarily occurs through baroreceptor and chemoreceptor reflexes, involving both short-term and long-term mechanisms.
Baroreceptor Reflex
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The heart rate, or pulse rate, is a vital indicator of cardiovascular health. It reflects the number of times the heart beats per minute. Various physiological and environmental factors influence heart rate, increasing or decreasing cardiac output. Understanding these factors is crucial for assessing heart function and identifying potential health issues.
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When assessing blood pressure (BP), healthcare professionals must consider various factors and potential unexpected outcomes to ensure accurate readings and provide proper patient care. Adhering to these guidelines is essential to achieving the most reliable results.
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Implantation of Combined Telemetric ECG and Blood Pressure Transmitters to Determine Spontaneous Baroreflex Sensitivity in Conscious Mice
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Lower hemoglobin levels associate with higher baroreflex sensitivity and heart rate variability.

Joona Tapio1, Antti M Kiviniemi2, Juha Perkiömäki2

  • 1Biocenter Oulu and Faculty of Biochemistry and Molecular Medicine, Oulu Center for Cell-Matrix Research, University of Oulu, Oulu, Finland.

American Journal of Physiology. Heart and Circulatory Physiology
|August 11, 2023
PubMed
Summary

Lower hemoglobin (Hb) levels are linked to better heart rate variability (HRV) and baroreflex sensitivity (BRS) in middle-aged adults. This suggests Hb may indicate cardiometabolic risk, independent of other factors.

Keywords:
baroreflex sensitivityheart rate variabilityhemoglobinhypoxiametabolic syndrome

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Area of Science:

  • Cardiovascular Physiology
  • Autonomic Nervous System Function
  • Hematology

Background:

  • Heart rate variability (HRV) and baroreflex sensitivity (BRS) are non-invasive markers that predict cardiac and metabolic disease risk.
  • Hemoglobin (Hb) levels, even within normal ranges, may influence cardiovascular autonomic function.
  • Previous research suggests a link between Hb levels and cardiometabolic risk.

Purpose of the Study:

  • To investigate the association between hemoglobin (Hb) levels within normal variation and measures of heart rate variability (HRV) and baroreflex sensitivity (BRS).
  • To determine if Hb levels independently associate with cardiac autonomic function in middle-aged adults.

Main Methods:

  • Cross-sectional study of 733 Finnish adults (41-59 years) from the OPERA cohort.
  • Measurement of HRV and baroreflex sensitivity (BRS) over a standardized 45-minute period.
  • Analysis of hemoglobin (Hb) levels within Finnish reference intervals, categorized into tertiles.
  • Statistical analysis including stepwise logistic regression, adjusting for covariates like age, sex, smoking, and metabolic factors.

Main Results:

  • Subjects in the lowest Hb tertile (mean Hb 135 g/L) exhibited higher BRS, longer R-R intervals (RRi), greater standard deviation of RRi (SDNNindex), and higher high-frequency (HF) power compared to the highest Hb tertile (mean Hb 152 g/L).
  • Lower Hb levels were independently and negatively associated with BRS, SDNNindex, and HF power, even after adjusting for covariates.
  • These associations indicate healthier cardiac autonomic function in individuals with lower Hb levels within the normal range.

Conclusions:

  • Lower hemoglobin (Hb) levels within the normal range are independently associated with enhanced cardiac autonomic function, characterized by better baroreflex sensitivity and heart rate variability.
  • These findings suggest that Hb levels may serve as a valuable indicator for assessing long-term cardiometabolic disease risk.
  • The results highlight the importance of considering Hb levels in the context of cardiovascular health assessment.